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c81b35c0 KS |
1 | /* |
2 | * udev_lib - generic stuff used by udev | |
3 | * | |
4 | * Copyright (C) 2004 Kay Sievers <kay@vrfy.org> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation version 2 of the License. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | * | |
19 | */ | |
20 | ||
21 | ||
22 | #include <stdlib.h> | |
23 | #include <stdio.h> | |
4a539daf | 24 | #include <stddef.h> |
c81b35c0 KS |
25 | #include <unistd.h> |
26 | #include <fcntl.h> | |
4a539daf KS |
27 | #include <errno.h> |
28 | #include <dirent.h> | |
c81b35c0 KS |
29 | #include <sys/stat.h> |
30 | #include <sys/mman.h> | |
31 | ||
c81b35c0 | 32 | #include "udev.h" |
4a539daf | 33 | #include "logging.h" |
c81b35c0 | 34 | #include "udev_lib.h" |
4a539daf | 35 | #include "list.h" |
c81b35c0 KS |
36 | |
37 | ||
38 | char *get_action(void) | |
39 | { | |
40 | char *action; | |
41 | ||
42 | action = getenv("ACTION"); | |
43 | if (action != NULL && strlen(action) > ACTION_SIZE) | |
44 | action[ACTION_SIZE-1] = '\0'; | |
45 | ||
46 | return action; | |
47 | } | |
48 | ||
49 | char *get_devpath(void) | |
50 | { | |
51 | char *devpath; | |
52 | ||
53 | devpath = getenv("DEVPATH"); | |
54 | if (devpath != NULL && strlen(devpath) > DEVPATH_SIZE) | |
55 | devpath[DEVPATH_SIZE-1] = '\0'; | |
56 | ||
57 | return devpath; | |
58 | } | |
59 | ||
4b06c852 | 60 | char *get_devname(void) |
89fe4e00 | 61 | { |
4b06c852 | 62 | char *devname; |
89fe4e00 | 63 | |
4b06c852 | 64 | devname = getenv("DEVNAME"); |
65 | if (devname != NULL && strlen(devname) > NAME_SIZE) | |
66 | devname[NAME_SIZE-1] = '\0'; | |
89fe4e00 | 67 | |
4b06c852 | 68 | return devname; |
89fe4e00 GKH |
69 | } |
70 | ||
c81b35c0 KS |
71 | char *get_seqnum(void) |
72 | { | |
73 | char *seqnum; | |
74 | ||
75 | seqnum = getenv("SEQNUM"); | |
76 | ||
77 | return seqnum; | |
78 | } | |
79 | ||
80 | char *get_subsystem(char *subsystem) | |
81 | { | |
82 | if (subsystem != NULL && strlen(subsystem) > SUBSYSTEM_SIZE) | |
83 | subsystem[SUBSYSTEM_SIZE-1] = '\0'; | |
84 | ||
85 | return subsystem; | |
86 | } | |
87 | ||
7b9b1839 KS |
88 | #define BLOCK_PATH "/block/" |
89 | #define CLASS_PATH "/class/" | |
90 | #define NET_PATH "/class/net/" | |
91 | ||
f61d732a KS |
92 | char get_device_type(const char *path, const char *subsystem) |
93 | { | |
7b9b1839 KS |
94 | if (strcmp(subsystem, "block") == 0) |
95 | return 'b'; | |
96 | ||
97 | if (strcmp(subsystem, "net") == 0) | |
98 | return 'n'; | |
99 | ||
100 | if (strncmp(path, BLOCK_PATH, strlen(BLOCK_PATH)) == 0 && | |
101 | strlen(path) > strlen(BLOCK_PATH)) | |
f61d732a KS |
102 | return 'b'; |
103 | ||
7b9b1839 KS |
104 | if (strncmp(path, NET_PATH, strlen(NET_PATH)) == 0 && |
105 | strlen(path) > strlen(NET_PATH)) | |
f61d732a KS |
106 | return 'n'; |
107 | ||
7b9b1839 KS |
108 | if (strncmp(path, CLASS_PATH, strlen(CLASS_PATH)) == 0 && |
109 | strlen(path) > strlen(CLASS_PATH)) | |
f61d732a KS |
110 | return 'c'; |
111 | ||
112 | return '\0'; | |
113 | } | |
114 | ||
7a947ce5 KS |
115 | void udev_set_values(struct udevice *udev, const char* devpath, const char *subsystem) |
116 | { | |
117 | memset(udev, 0x00, sizeof(struct udevice)); | |
118 | strfieldcpy(udev->devpath, devpath); | |
119 | strfieldcpy(udev->subsystem, subsystem); | |
120 | udev->type = get_device_type(devpath, subsystem); | |
121 | } | |
122 | ||
c81b35c0 KS |
123 | int file_map(const char *filename, char **buf, size_t *bufsize) |
124 | { | |
125 | struct stat stats; | |
126 | int fd; | |
127 | ||
128 | fd = open(filename, O_RDONLY); | |
129 | if (fd < 0) { | |
130 | return -1; | |
131 | } | |
132 | ||
133 | if (fstat(fd, &stats) < 0) { | |
686cecf2 | 134 | close(fd); |
c81b35c0 KS |
135 | return -1; |
136 | } | |
137 | ||
138 | *buf = mmap(NULL, stats.st_size, PROT_READ, MAP_SHARED, fd, 0); | |
139 | if (*buf == MAP_FAILED) { | |
686cecf2 | 140 | close(fd); |
c81b35c0 KS |
141 | return -1; |
142 | } | |
143 | *bufsize = stats.st_size; | |
144 | ||
145 | close(fd); | |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
150 | void file_unmap(char *buf, size_t bufsize) | |
151 | { | |
152 | munmap(buf, bufsize); | |
153 | } | |
154 | ||
155 | size_t buf_get_line(char *buf, size_t buflen, size_t cur) | |
156 | { | |
157 | size_t count = 0; | |
158 | ||
159 | for (count = cur; count < buflen && buf[count] != '\n'; count++); | |
160 | ||
161 | return count - cur; | |
162 | } | |
163 | ||
aef6bb13 KS |
164 | void leading_slash(char *path) |
165 | { | |
166 | int len; | |
167 | ||
168 | len = strlen(path); | |
169 | if (len > 0 && path[len-1] != '/') { | |
170 | path[len] = '/'; | |
171 | path[len+1] = '\0'; | |
172 | } | |
173 | } | |
174 | ||
175 | void no_leading_slash(char *path) | |
176 | { | |
177 | int len; | |
178 | ||
179 | len = strlen(path); | |
180 | if (len > 0 && path[len-1] == '/') | |
181 | path[len-1] = '\0'; | |
182 | } | |
183 | ||
4a539daf KS |
184 | struct files { |
185 | struct list_head list; | |
186 | char name[NAME_SIZE]; | |
187 | }; | |
188 | ||
189 | /* sort files in lexical order */ | |
190 | static int file_list_insert(char *filename, struct list_head *file_list) | |
191 | { | |
192 | struct files *loop_file; | |
193 | struct files *new_file; | |
194 | ||
195 | list_for_each_entry(loop_file, file_list, list) { | |
196 | if (strcmp(loop_file->name, filename) > 0) { | |
197 | break; | |
198 | } | |
199 | } | |
200 | ||
201 | new_file = malloc(sizeof(struct files)); | |
202 | if (new_file == NULL) { | |
203 | dbg("error malloc"); | |
204 | return -ENOMEM; | |
205 | } | |
206 | ||
207 | strfieldcpy(new_file->name, filename); | |
208 | list_add_tail(&new_file->list, &loop_file->list); | |
209 | return 0; | |
210 | } | |
211 | ||
aef6bb13 | 212 | /* calls function for every file found in specified directory */ |
4a539daf KS |
213 | int call_foreach_file(int fnct(char *f) , char *dirname, char *suffix) |
214 | { | |
215 | struct dirent *ent; | |
216 | DIR *dir; | |
217 | char *ext; | |
218 | char file[NAME_SIZE]; | |
219 | struct files *loop_file; | |
220 | struct files *tmp_file; | |
221 | LIST_HEAD(file_list); | |
222 | ||
223 | dbg("open directory '%s'", dirname); | |
224 | dir = opendir(dirname); | |
225 | if (dir == NULL) { | |
226 | dbg("unable to open '%s'", dirname); | |
227 | return -1; | |
228 | } | |
229 | ||
230 | while (1) { | |
231 | ent = readdir(dir); | |
232 | if (ent == NULL || ent->d_name[0] == '\0') | |
233 | break; | |
234 | ||
235 | if ((ent->d_name[0] == '.') || (ent->d_name[0] == COMMENT_CHARACTER)) | |
236 | continue; | |
237 | ||
238 | /* look for file with specified suffix */ | |
239 | ext = strrchr(ent->d_name, '.'); | |
240 | if (ext == NULL) | |
241 | continue; | |
242 | ||
243 | if (strcmp(ext, suffix) != 0) | |
244 | continue; | |
245 | ||
246 | dbg("put file '%s/%s' in list", dirname, ent->d_name); | |
247 | file_list_insert(ent->d_name, &file_list); | |
248 | } | |
249 | ||
250 | /* call function for every file in the list */ | |
251 | list_for_each_entry_safe(loop_file, tmp_file, &file_list, list) { | |
252 | strfieldcpy(file, dirname); | |
253 | strfieldcat(file, "/"); | |
254 | strfieldcat(file, loop_file->name); | |
255 | ||
256 | fnct(file); | |
257 | ||
258 | list_del(&loop_file->list); | |
259 | free(loop_file); | |
260 | } | |
261 | ||
262 | closedir(dir); | |
263 | return 0; | |
264 | } | |
6e3e3c34 HH |
265 | |
266 | /* Set the FD_CLOEXEC flag of desc if value is nonzero, | |
267 | or clear the flag if value is 0. | |
268 | Return 0 on success, or -1 on error with errno set. */ | |
269 | ||
270 | int set_cloexec_flag (int desc, int value) | |
271 | { | |
272 | int oldflags = fcntl (desc, F_GETFD, 0); | |
273 | /* If reading the flags failed, return error indication now. */ | |
274 | if (oldflags < 0) | |
275 | return oldflags; | |
276 | /* Set just the flag we want to set. */ | |
277 | if (value != 0) | |
278 | oldflags |= FD_CLOEXEC; | |
279 | else | |
280 | oldflags &= ~FD_CLOEXEC; | |
281 | /* Store modified flag word in the descriptor. */ | |
282 | return fcntl (desc, F_SETFD, oldflags); | |
283 | } |